I upgraded a 6 year old computer to Win 7 with a new CPU and Mobo and PSU, now I have no SLI in games! Runs stable so far in daily use. It scored Windows Experience Index of 5.9 with one video card installed and a whopping 6.0 in SLI in the Graphics and Gaming Graphics sub scores. I know the cards are (very) old in terms of GPUs, but I was hoping to squeak out a few more years.

I have the newest drivers from Nvidia installed and SLI enabled from the Nvidia control panel. I have installed some older title games and had failures in each case. It BSoDs in Bioshock or dumps the video to the desktop in Medal of Honor. I can click the program in the task bar and the video comes, flickers and dumps back to the desktop, however the program does not terminate. Since it happens at the launch of the game and the temps seem cool I have not considered heat to be the factor and with a new 850W PSU I am not leaning towards that as an issue.

Bioshock would BSoD: STOP: 0x0000016 ... (more interesting is) nvlddmkm.sys also shows up as a culprit, an Nvidia driver file?

I have tried replacing the nvlddmkm.sys from the .sy_ file and no luck. The device manager see both cards, they both are plugged into the PSU and the SLI bridge is installed.

Thoughts?

Thanks.

Last edited by Walby on Tue May 28, 2013 9:49 am, edited 1 time in total.

When you install NVIDIA's drivers and get to the page to select the components, there's an option for a clean install. Although, this is assuming you've selected the advanced/custom setup and not the quick one.

There is no video output from the lower card, the one plugged into the PCIe 3.0 x16_2. It doesn't matter which card is plugged into that slot, there is no video output from either DVI output on that card. The power to each card had been checked using the power to the known good card in the _1 position.

The computer runs the Windows Experience Index test and returns results while in SLI and in single card. Although the score is the same. (different result than first run where 5.9 was the first score and 6.0 was SLI)

There is no known jumper or BIOS setting to enable SLI on the mobo, it should all be controlled from the Nvidia control panel.

Have you tried taking the top card and switching it with the bottom card to see if the bottom card is dead? After the switch does the new bottom card output video? Is the new top card outputting video?

Have you tried using the last pcie slot...hope you have a bridge that will span the gap.

I have a Sabertooth 990FX motherboard and in the bios there is an option to connect the two video cards together. You should take a slow tour through the bios and see if you have these options as well, if so enable them.

SLI option show up in the driver and can you enable it?

If all else fails follow my instructions to uninstall the video driver and install the new one.

I wonder if this is the case of forward compatibility not always being compatible? The 7800 are PCIe 1.1 right and you have 3.0 slots? By all rights they should work, but for what ever reason they were not playing nice!

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